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Unaudited Quarterly Financial Information Unaudited Quarterly Financial Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Quarterly Financial Information Disclosure [Abstract]
Operating expenses	$ 10,086	$ 10,360	$ 10,129
Operating income	2,228	1,694	2,411
Net income (loss)	$ 1,135	$ 500	$ 1,108

X

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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